Description

4.2mm diameter and 43mm working length.
Metal drill bits HSS Ground – DIN 338.
The THUNDERWEB design is characterised by a conical shaped web which gets thicker towards the back of the drill bit. The web is the internal core of the drill bit.

Parabolic web cross section
Large web thickness. Strength built in.
Accepts higher feed pressure and torque.
Less breakages. Good for drilling deep holes and on curved surfaces.
Long life.

Flute Geometry
THUNDERWEB flute form ejects hot chips rapidly. Dissepates heat better increasing lifetime.
Open flute form reduces drill drawback when drilling deeper holes.
Sharpened edges reduce binding for faster cleaner cuts.
Flatter twist angle creates smaller chippings, ideal for drilling harder steels ie: stainless steel.